Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95fff5fef1d85e9…

MALICIOUS

PDF

76.0 KB Created: 2021-04-09 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b93f32a0d4e45d212ff3c9d0db0dc6fa SHA-1: f579ec78941f8ea6da3162ddf5582818d1f9409f SHA-256: f95fff5fef1d85e92ee9af06c4590b5aa9980bbfa9c5796e15b224464c8504c8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://pelibifir.ru/strik?utm_term=beats+studio+wireless+pairing+android' appears to be a lure, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=beats+studio+wireless+pairing+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fc8d25a9a035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_60136251b3d96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_60084b70e3e74.pdfIn PDF document text
    • http://towesijep.iblogger.org/year_2_fractions_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/gg4RgeW/dell_p2419h_monitor_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/gfGiagi/16993640594.pdfIn PDF document text
    • https://cdn.sqhk.co/kirovuwuvo/YPCmies/mujuwafofibil.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/RJuWq6G/rapanafenile.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/mufajakejebevotoziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfedf0fa-ea37-44f0-ac61-aa14f383e0a1/70231185531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3969a215-f041-496e-a2bb-a97b0af0aa03/first_alert_keeps_beeping_3_times.pdfIn PDF document text
    • http://dovijurosovixen.rf.gd/71678163836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f105ec92-ea57-4e74-bd0b-0908cbe4cec1/74916736570.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_4dca43a0c5e04a83865378d64095268f.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_fdeeb29fb6914553b7e64373d8ba5111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98cf66c6-f4b5-493e-9228-9fcc15a59d7b/25011836730.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/the_economist_24_november_2020.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5268 bytes
SHA-256: fa06fd13974995c9d2d955087b128e18720c20c2a184aaa18552161ae6d0fa97
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 11100 bytes
SHA-256: 899dba1b6fa6deec65929ab0561aea0176cef20e56ba669ee3421a0a63460934

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